Roland SH-5 Service Manual

1976-10-30 SH-5
12. ADJUSTMENT
CAUTION
Be sure to check the power supply voltages before troubleshooting or adjusting the following circuits.
±14V: All circuits
The following equipment is necessary for adjustment:
Digital Voltmeter
Frequency Counter
(Tuning Meter)
±10V- KB-1, VCO-1, VCO-2,
Osciloscope
Audio Generater
(Audio Amplifier and Speaker)
Although not necessary, an audio amplifier and speaker can be very convenient when making adjustments.
All ground connections for test equipment can be made at Terminal 6 (black) on the OP-19 circuit board, or to any
terminal with a grounded shield connection.
Be sure all front panel controls are set as shown in the drawings before making adjustments.
Make sure that slide switches on the front panel are not set between positons as this will upset adjustments.
For potentiometer adjustments, right means clockwise and left means counterclockwise.
Pressing a key on the keyboard establishes the control voltage for that key at the VCO. This voltage will remain after
release of the key, but due to leakage, the VCO frequency will gradually drift downwards. For this reason, all measure
ments and adjustments related to the keys should be done while holding the related key down. A small lead weight may
prove useful.
12-1 ±14 VOLT adjustment
Adjust VR-801 for +14 volts,
±100mV.
Adjust VR-802 for -14 volts,
±100mV.
OOOO
-14V +14V
VR802 VR801
POWER SUPPLY BOARD
ASSEMBLY
(PS-17orPS-23)
DIGITAL VOLTMETER
12-2 ± 10 VO LT adjustment
Adjust VR-201 for
+10 volts, ±5mV
Adjust VR-202 for
-10 volts, ±5mV.
-10V
(VR-202)
+10V
(VR-201)
CIRCUIT BOARD
ASSEMBLY
(OP-19)
DIGITAL VOLTMETER
{+I0V)
\±!o:ooov\
12-2-2 LFO-1 Adjustment
,LF<W
FREQ ADJ
(VR205)
0V ADJ
(VR206)
CIRCUIT BOARD
ASSEMBLY
(OP-19)
OSCILLOSCOPE
-34-
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Roland SH-5 Specifications

General

Brand	Roland
Model	SH-5
Category	Synthesizer
Language	English